ROSA: A Data Model and Query Language for e-Learning Objects

Abstract

Learning Content Management Systems (LCMS) supports e-learning applications with storage and efficient access for e-learning objects (LO)s. ROSA is a LCMS built as a semantic layer on the top of an XML native DBMS, Tamino. Together, ROSA and Tamino, offer instructional designers a semantic view of e-learning content. In this paper, we present ROSA Data Model and Query Language, designed as an extension to RDF data model and RQL query language. The Data Model is structured around the LO modeling and their relationships, adapted to the e-learning domain. An algebra defines valid operations over LO data. Queries are formulated in ROSAQL that extends RQL with joins, graph navigation and recursion.

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